o New option: adjustTilesForRetinaDisplay

Doubles the tile size so that the map looks the same on retina and non-retina displays

@@ -44,8 +44,8 @@
     self.opaque = NO;
 
     CATiledLayer *tiledLayer = [self tiledLayer];
-    tiledLayer.levelsOfDetailBias = [[mapView tileSource] maxZoom];
     tiledLayer.levelsOfDetail = [[mapView tileSource] maxZoom];
+    tiledLayer.levelsOfDetailBias = [[mapView tileSource] maxZoom]+1;
 
     UITapGestureRecognizer *doubleTapRecognizer = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleDoubleTap:)] autorelease];
     doubleTapRecognizer.numberOfTapsRequired = 2;

@@ -77,6 +77,7 @@ typedef enum {
     RMMapOverlayView *overlayView;
 
     double metersPerPixel;
+    BOOL adjustTilesForRetinaDisplay;
 
     NSMutableArray *annotations;
     NSMutableSet   *visibleAnnotations;
@@ -141,6 +142,8 @@ typedef enum {
 @property (nonatomic, readonly) float screenScale;
 @property (nonatomic, assign)   NSUInteger boundingMask;
 
+@property (nonatomic, assign) BOOL adjustTilesForRetinaDisplay;
+
 @property (nonatomic, assign) float zoom; /// zoom level is clamped to range (minZoom, maxZoom)
 @property (nonatomic, assign) float minZoom;
 @property (nonatomic, assign) float maxZoom;

@@ -82,6 +82,7 @@
 @synthesize tileCache;
 @synthesize quadTree;
 @synthesize enableClustering, positionClusterMarkersAtTheGravityCenter, clusterMarkerSize;
+@synthesize adjustTilesForRetinaDisplay;
 
 #pragma mark -
 #pragma mark Initialization
@@ -111,6 +112,7 @@
     }
 
     boundingMask = RMMapMinWidthBound;
+    adjustTilesForRetinaDisplay = YES;
 
     annotations = [NSMutableArray new];
     visibleAnnotations = [NSMutableSet new];
@@ -894,7 +896,11 @@
 
     tiledLayerView = [[RMMapTiledLayerView alloc] initWithFrame:CGRectMake(0.0, 0.0, contentSize.width, contentSize.height) mapView:self];
     tiledLayerView.delegate = self;
-    ((CATiledLayer *)tiledLayerView.layer).tileSize = CGSizeMake(tileSideLength, tileSideLength);
+    if (self.adjustTilesForRetinaDisplay && screenScale > 1.0) {
+        RMLog(@"adjustTiles");
+        ((CATiledLayer *)tiledLayerView.layer).tileSize = CGSizeMake(tileSideLength * 2.0, tileSideLength * 2.0);
+    } else
+        ((CATiledLayer *)tiledLayerView.layer).tileSize = CGSizeMake(tileSideLength, tileSideLength);
     [mapScrollView addSubview:tiledLayerView];
 
     [mapScrollView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:NULL];
@@ -1244,6 +1250,14 @@
     mapScrollView.scrollEnabled = enableDragging;
 }
 
+- (void)setAdjustTilesForRetinaDisplay:(BOOL)doAdjustTilesForRetinaDisplay
+{
+    if (adjustTilesForRetinaDisplay == doAdjustTilesForRetinaDisplay) return;
+
+    adjustTilesForRetinaDisplay = doAdjustTilesForRetinaDisplay;
+    [self createMapView];
+}
+
 - (RMProjection *)projection
 {
     return [[projection retain] autorelease];